How does one make a bottom less pit and bottom less pit fog for exmaple I have a bts area I want it to look bottom less ?

There is an instance that has all the fog entities you can put into your map. Put this in and this will take care of the blueish-fog aspect.
In order to make a bottomless pit put skybox texture (as long as your skybox texture is black in your map properties) below/deep below your map and this will create the illusion of a bottomless pit.

Also there is a couple of models that look like distance objects. They are usually just black in colour.

Tryed it did not work heres the pics:

http://i55.tinypic.com/2ev40uo.png

http://steamcommunity.com/id/Reloadz/sc ... 2274052739

the hammer picture with the room below it is the skybox room like you said to do

There is a difference between the skybox texture and a 3D skybox.

I got it to work NVM!

Excuse me, could anyone please describe the process of creation in more details?
Thanks in advance.
edit: Scratch that. It's been resolved.